20213312 has 28 divisors (see below), whose sum is σ = 45841920. Its totient is φ = 8662656.

The previous prime is 20213309. The next prime is 20213317. The reversal of 20213312 is 21331202.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (28).

It is a Harshad number since it is a multiple of its sum of digits (14).

It is not an unprimeable number, because it can be changed into a prime (20213317) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22112 + ... + 23007.

Almost surely, 2^20213312 is an apocalyptic number.

It is an amenable number.

20213312 is an abundant number, since it is smaller than the sum of its proper divisors (25628608).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20213312 is an equidigital number, since it uses as much as digits as its factorization.

20213312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45138 (or 45128 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 20213312 is about 4495.9217075034. The cubic root of 20213312 is about 272.4033807224.

Adding to 20213312 its reverse (21331202), we get a palindrome (41544514).

The spelling of 20213312 in words is "twenty million, two hundred thirteen thousand, three hundred twelve".